[sgo70]

I'm starting to build my engine and already have a question. I was going to gap the rings but there isn't much direction and they came in a plain white box. They came with my Scat rotating assembly here:

http://www.jegs.com/i/Scat/942/1-92000BE/10002/-1

The pistons have directions for "KB Claimer tech tips". It gives me a ring end gap factor of 0.0065" for street normally aspirated, I figure this is what best describes mine (AFR heads, comp xe262 cam.....). So from this I get a ring gap of .0262 or .026 for my measurements. This is all I got, so do I do all the rings with that gap, I thought the 2nd ring was opened up a bit more??

Also the ring have 8 with the shiney sides and 8 just plain sides same color as the tops. I assume the shiney ones go on top then the dull ones next followed by the other set.

Thanks,
Sean

[327NUT]

I sure hope you havn't taken all the rings out of their plain white boxes and gotten them mixed up. The boxes should state...top ring...second ring or the equivalent. The rings also have little "pip" marks on them which indicates "up".

NORMAL ring gaps for non-supercharged or non-nitrous applications are usually .004 for every inch of bore, but there is a lot of leeway on ring gaps. If you did get them mixed up take to an engine builder and pay him if you have to to get them figured out...good luck.

[sgo70]

They came in a white box with three compartments, the oil scraper, the shiney, and the plain, pretty easy to tell them apart. I looked and there are no markings whatsoever, I've built motorcycle engines before that have the dot punched in or a certain bevel etc, but these are plain top and bottom. I assume the shiney ones go on top and that's the one that needs the larger end gap due to the heat transfer of the hyper pistons. I wasn't sure about the others but I'm thinking it should be about .002" otherwise they would probably have put something in there.

I was just hoping for a little confirmation .

Sean

[techinspector1]

Hypers run hotter on the top ring, so it must be gapped wider on assembly. You are correct on the 0.026"/0.027" top ring gap. The second ring can be gapped conventionally at 0.0045" per inch of bore. (0.018" on a 4" bore)

The top ring will have a small chamfer on the topside i.d. of the ring. As combustion begins, pressure comes down the side of the piston, enters between the top of the ring and its ring land, then around to the back of the ring to push the ring out against the cylinder bore. This little chamfer on the top corner allows the gases to get behind the ring. The second ring is a scraper ring and the chamfer goes on the bottom.

[sgo70]

Hey Tech, there ya are answering my questions again. I think I just needed a little back-up on this to be sure. Got them all gapped but they still don't seem to have a chamfer on them. I'll check again tomorrow to make sure. The directions do have an example of all the different types and one is just a rectangle profile.

Sean

[C-10]

Techinspector1 has it straight. 4.030" bore- .026" gap on top ring.

There should be some kind of little marking on one end of the ring denoting which way is up. As pointed out above the chamfer goes up. There should be a chamfer.

The second ring should have a tapered FACE- the part that meets the cylinder wall. Look very closely. The larger diameter of that taper should point down.

Sounds like a super generic set of rings. Consider some Speed Pros. There's no doubting how they install.

[sgo70]

Okay now I'm getting confused.

I got all the rings gapped and even phoned KB to make sure the shiney one was the top. Now I'm looking at the second ring and it has a chamfered inside corner and a dot on the opposite side . The directions say to install the dot towards the top of the piston but that will put the chamfer opposite what you said facing down????

Or C10 did you mean as the larger diameter down as in the chamfer going away from the piston wall facing down like this:

/I Where I would be the piston wall (sorry best I could think of)
/I



Sean

[C-10]

Originally Posted by sgo70

Okay now I'm getting confused.

I got all the rings gapped and even phoned KB to make sure the shiney one was the top. Now I'm looking at the second ring and it has a chamfered inside corner and a dot on the opposite side . The directions say to install the dot towards the top of the piston but that will put the chamfer opposite what you said facing down????

Or C10 did you mean as the larger diameter down as in the chamfer going away from the piston wall facing down like this:

/I Where I would be the piston wall (sorry best I could think of)
/I



Sean

See picture. Slight exaggeration of ring faces to show detail.

[C-10]

Or is THIS how your secong ring is?

[sgo70]

That last one is how it looks. I phoned around and from the part number we figured out who makes them and how to install them. I was surprised at how hard it was to get someone who knew about them. Thanks a lot for your help now I gotta figure out my pushrod length .

Sean